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Axle Extensions

4782 Views 7 Replies 5 Participants Last post by  johnburns
I was thinking about putting 8" axle extensions on my 6620 to get it to straddle 4 rows. As it is now it runs over 2-5 (6 row head) with about 6-8" of the inside of the tires and it really eats the heck out of the tires over the period of several yrs. Am I asking for trouble and should just let it eat up tires and avoid the other axle related problems I fear could crop up(Finals, ect). Thanks
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I've never tried them, but have you heard of "stalk stompers". They mount on your head and push the stalks down.
I have heard of stalk stompers, but I would really rather see the stalks stand up. I do custom work for several guy's that raise milo and graze or bale the stalks for cattle feed. The more feed left standing the better they like it. Thanks for the idea.
If you just use a hub spacer it will add extra strain on the axles and bearings but if you put the extensions that actually space the whole final drives out it should not put any additional strain on anything and make the combine drive much better and be more stable. These spacers have a heavy rod that goes across between the two final drives to add extra strength to the assembly. I ran them on a 6620 that had big terra tires so the hubs would be in the center of the tire and not cause axle/bearing troubles.

How did those terra tires work for you? Did they increase floatation a lot? Do they wear very fast?
I'm asking because I have some "springey" muck and I'm tired of getting stuck so easily.

Quote:John Burns wrote
I ran them on a 6620 that had big terra tires so the hubs would be in the center of the tire and not cause axle/bearing troubles.

I would really like to see a picture of them terrra tires on a 6620. And just currious what size of terra tires did you have on it? Thanks for the feed back
Dad ran "Big A" tires on his 6620 and 7720. They were 43 x 66 x 32. I sold them about 10 years ago, as they were to small for a 9600 (used 44 x 73 x 32 for the 9600).

The big tires were great for reduced ground pressure. Before we bought them in the mid '80's, we also had a "G" Gleaner. The G would go while the 7720 sat because the tracks were to deep. After we added the Big A tires to the JD, it went better in soft conditions than the Gleaner.

Dad also added duals to the rear of the JD, but I don't remember what he used. They were probably smooth tires with shop built spacers. IIRC, the power steering didn't handle the duals very well. If you forget bigger tires on the rear, the big ones on the front won't help.

The stubble stompers were available for the row crop heads. You just put them on the rows that the tires were running over. I think they were essential for cutting beans. In milo, they just lean the stalk over so the tire flattens it without injury.
Terra's on 6620

Most of the 6620's around here used the smaller Big A size terras but they were small enough in diameter that the final drives would not fit inside of the rims so axle extensions could not be used - and they broke a lot of axles with them because of the large offset where the tires were sticking way out beyond the final drives. I ran the 44x73x32 (at that time the "big" terras) and had the center welded actually a little past center and used the axle extensions so the final drive sat about in the middle of the tire. Never had any axle problems although did put bearings in at about 2500 hours as they were getting loose and upon dis-assembly one was blue so was about to go. Ran the combine to about 3000 hours then traded it.

I really like terras better than duals (most will disagree with that) but the whole idea behind them is to keep you on top. As soon as you go down a rice tire or something made to cut through the mud would be better. Once you go down the terras are so wide it is a long way around for the mud to flow and a long way to clean out the mud from the lugs. As long as they provide enough flotation to keep you on top they are great in soft soils. They would not be very good on sticky heavy clay soils - in just "wrong" conditions soy stubble will stick to them and build up enough to start pushing on the underside of the combine but anyone that has those kind of soils already knows the danger.

Can't remember the length of extensions I used but I would guess 12" or maybe 14" to get the final drives to the center of the tires and have enough clearance to the side of the combine.

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